True Derw, but honestly, while you may not have experienced any problems, other people can. Thats why it is strongly recommended to keep away from alcohol. And you are right, I am not 100% definitive about my statement, but it IS my opinion.
I could care less about Mercury in Tuna, but Wrangell, drinking alcohol during pregnancy is the worst thing you can do (As I learned in my psychology class). So all in all, do not let a drop of alcohol into your system when pregnant.